Is it safe to assume the Note 4 will get this revamped TouchWiz design unveiled for the S6?

I'll b honest, as much as I'd like this as well is highly unlikely, reason is this is one on the selling points to the Galaxy S6, an might b a selling point for the Note 5 later this year in October, but since but since the Galaxy S6 comes with 5.0.2 lollipop. Note 4 user may see it in a later update 5.0.2 or later tho USA don't even have 5.0.1 yet...

An your talking the Galaxy S series too not the Note series, the Note as more features over all so I'm not really sure how much lighter they can really make it.

A root solves most of these issue cause you cause remove bloatware anyways so I guess we will have to see what Samsung decides, personally they I think they made a big mistake by No removable battery and no sd slot.